Land Rover Discovery 2 Cooling System and Thermostats 

Nice! That's the biggest improvement I've ever heard of. Congrats.

That’s great. The more we spread the good word of the Ultraguage, the more Rovers we save 😉

I would say any solid aftermarket 180 stat does the trick at least it did for me and I’m in the Palm Springs area where it gets 120 on hot days. Like I think I got mine for 30 bucks, and it was Brit parts maybe? But yeah I have preached a bunch of times COOLING

@@joseavitia1054 Palm Springs. You know the pain of real heat ;)

Will electric fans help with temperature?,I live in Nevada.

@@antoniomaldonado683 From what I have researched, running dual electric fans is very expensive and fabricating a shroud is not easy. You would also have to deal with turning them off at cruising speeds. Could be a fun project, but I'm not sure it would be worth it.

I switched over to the inline it is dramatically better we've been at 110° Plus for the last 2 months I can run the AC on cruising through soft sand or at stop lights and I'm at 189 Max usually about 183. Finally realized the original is stupid doesn't make sense other than a huge bypass which interferes with the flow having to go backward once it's supposedly closes? Here's the real real major drawback why would they place the thermostat after the radiator Downstream from it so that the thermostat gets cooled down water to decide whether I should open? Shouldn't the thermostat be interacting with the hot water directly out of the engine and then deciding to send it into the radiator? This is how literally every other engine is made even the Rover V8 when it was carbureted had a thermostat up on the top by the water pump. Having a thermostat interacting with hot engine water before the radiator is literally the only thing that makes sense there's no reason to have a thermostat after the radiator. Why would you want your thermostat make a decision on whether or not it should open based on cooled down water post radiator? Don't listen to anyone about the factory when it's stupid even if they get a TD 5 180 thermostat it doesn't matter gaining a 10 degree Head Start doesn't mean anything the system is still going to flow poorly and keep trying to shut because the water from the radiator feels cool to it and it wants to close. Get the inline I guarantee you it'll blow your mind especially if you live in Arizona. On my inline I have to switch from the 180 element to the 190 element to keep it in one 90s because the 180 element was making me hit 170s if it was under 90 degrees in the winter and I would throw a low temp code every once in awhile and have worst fuel efficiency. The inline is so good

Glad you enjoyed it!

I haven't upgraded my fan yet, but I'm going to look into it. Thanks for those part numbers.

Are the numbers on Dorman and Hayden for replacing the main fan or the smaller electric auxiliary condenser fan up front? I have been fighting overheating problems on my 2001 Disco 2 for roughly a month now and watched probably 50 videos, but yours is the only one that mentioned that the fan clutch is blown if the fan moves freely with the engine off. THANK YOU

@@johnengvall1793 The main - the condenser fan is actually really common, on older Suzuki's ect. I had to replace mine and pulled one at a wrecker took the old one for comparison.

Interesting. Would not expect that.

Restricted exhaust will cause heat to back up in the manifold, head and motor will run hotter. Hot gases leaving the motor helps to take heat away.

I remember those. I haven't seen anything like that for the Rover though.

Yeah, that website is a piece of internet history.

@@fitzventure I installed the gauge and it works great. Thanks for the advice. I’m in NM and temperatures are in the 70s for now. The engine temps vary between 190° and 204°. I might follow some of your other advices to keep it below 215° if needed later in the season.

@@georgesmally2459 Yeah, that's high. In AZ, it's been in the mid-upper 90's. Running the A/C I'm looking at 188-194. I did hit 200 once after sitting after a long freeway drive.

Yeah, I would say it's more of a horizontal mount. It's still going strong and survived 115F temperatures last summer. I'm still happy with it.

Yeah, I later realized that number wasn't for the part. Oops. I have since added a FlowCooler water pump and a Chevy Blazer fan and fan clutch. My temps are now barely hitting 200 degrees these days. Maybe it's time for an updated video.

@@fitzventure sweet!

@@fitzventure Is the fan higher flow? If you don't mind what is the blazer fan part number or year and motor of blazer. Also did it bolt right in place of the factory LR fan?

@@ronaldrrootiii6040 Not sure if it's higher flow rate but it dropped temps about 3 degrees. I had to cut each blade 1/4 inch. Go to Discoweb.org and look at the recent posts. There's one about that cooling setup with all the details.

​@@fitzventure so I tried a few of the factory thermostats like the exact gray ones in the Land Rover boxes but I could never get under 198 and up to 220 so I went with the inline and wow it is so good that it brings me down to 178 and I throw a code for being too cold so I had to move up to the 190 element and now I'm in the 180s some of the guys on the Land Rover Facebook site they're crazy about the factory one but they live in cooler places and they use it on the TD5 I tell them this engine is bigger hotter and I live in a hot climate. They keep thinking I put the wrong one but I say no it's not overheating it's just warmer than I would prefer for longevity

Hasn't been a problem yet. The thermostat does a fine job of keeping the temp in the 180 range.

Depends on your climate, but it might difficult to get the heater working well in the extreme cold.

Not sure I understand what you mean.

You can get a 160 degree for DIsco1, it was a option for the 215 ci Buick engine.

As far as I know, any 180 or below would be good. The D1 didn't have the same (BMW) cooling system design as the D2 so you're in a better position.

Correct. Part number is: PEL500110

Thanks. I totally goofed that in the video.

There are a lot of options for showing different things on the screen. You'll have to find the engine temp reading. It's in there somewhere.

@@fitzventure I put the ultragauge on my other car and the coolant temperature does show up, then wen I put it back on to disco won't show up you think there's something Wrong with the disco?

@@Francisco-uf2gd I doubt it. That’s weird though. Maybe email Ulttraguage and see what they say.

@@fitzventure ok I think I got it if I take the battery of the car and put it back it takes a while to read the coolant temperature on the ultragauge

Oh yeah. Just hit 91,000 miles on it. I did more cooling mods too. I should make a new video.

@@fitzventure Doo it!!!

@@joshyddog2054 I did. Uploading tonight.

Yep, the system does have an upper limit even when it's working correctly. I hit 212 on 110+ degree day when idling long or on a big climb too (occasionally). Much less anxiety in the winter ;)

I have no idea what you’re talking about.

There is a small bypass hole in the thermostat so that it will flow regardless of it being open or closed.